SAN FRANCISCO — RF|Binder has acquired The Siren Agency, a San Francisco-based social impact-focused firm, in a move designed to bolster the agency’s CSR work and expand its West Coast presence.

Starting October 31, Siren Agency founder and CEO Annie Longsworth will join RF|Binder as executive MD of the newly created RFB|Siren division. Longsworth will also head RF|Binder’s new San Francisco office, working to increase the firm’s West Coast presence.

In announcing the expansion, RF|Binder said the move furthers its longtime commitment to working with purpose-driven brands and corporations, as well as not-for-profits. Additionally, the agency wants to expand its work helping clients find their voices on the big-impact issues.

"In the last several years, we have seen a significant shift in the value businesses, consumers and the investment community place on social and environmental impact. RFB|Siren is our response to that growing demand," said CEO Amy Binder. "Annie's experience in the CSR and social impact space is unparalleled, and she also understands how to extend the culture of an agency across the country, making her an ideal leader for our growing West Coast presence."

RF|Binder has led social impact strategy for clients including CVS Health, Tupperware Brands, Bank of America, Capital One and Dunkin' Brands. Longsworth, who launched The Siren Agency in 2015, has managed campaigns for Caesars Entertainment, the Coca-Cola Company, Johnson & Johnson, Tom's of Maine, and American Express among others.